I too am having this problem. One particular program (and Eclipse variant) falls victim to the auto-sandbox feature in Avast! Internet Security v7.0.1456. Nothing I can find will prevent this - disabling auto-sandbox, adding this particular program as an exception, changing the auto-sandbox settings to "ask" instead of "auto", disabling all real-time shields all do nothing.
I could possibly live with this program running in the sandbox, but the notification window stays in the foreground and cannot be closed. Really annoying. And as nicollo47 mentioned, the "Terminate now" button closes the program, but does not close the notification window. Not terribly helpful.
Does anyone have a solution for this?